Quote from Kramer in The Chinese Woman
Kramer: What would you say if I told you I never impregnated a woman?
Jerry: Really? You never slipped one past the goalie in all these years? Boy, I'm surprised. You've slept with a lot of women.
Kramer: A lot of women! Do you think maybe I'm... depleted?
Jerry: Well, I'm sure you're not totally depleted.
Kramer: Yeah, but what if I am? I'm the last male Kramer. We're facing extinction.
Jerry: So go to a fertility clinic, have your sperm count check.
Kramer: Yeah, but then I'd have to... Well, you know.... Into a cup in the middle of the day?
Elaine: What, does that conflict with your regular schedule?